Molar mass of hydrogen
2.02 g/molH₂
Molar mass
Molar mass. The mass of one mole in grams: add the atomic mass of every atom in the formula. Masses. Standard atomic masses to two decimals, hydrogen 1.008, every element to uranium. Typing. Ca(OH)2, (NH4)2SO4, CuSO4.5H2O and K4[Fe(CN)6] all work.
2.02g/mol
H₂
- H× 2100.00%
- H2 × 1.0082.016
- Total2.02 g/mol
Grams, moles, particles
Type any one. The other three fill in. Moles. From grams, particles or litres they are rounded to 3 significant figures first, as in a worked answer. 1 mol = 6.022 × 10²³ particles = 22.7 L of gas at STP (1 bar); 22.4 L at 1 atm.
1 mol of H₂ = 6.022 × 10²³ molecules
At 1 atm (older value): 22.40 L
Add up the atoms
- Hydrogen: 2 × 1.008 = 2.016 g
- Molar mass = 2 × 1.008 = 2.02 g/mol
Share of the mass
- Hydrogen100.00%
1 mol of H₂ = 2.02 g
1 g of H₂ = 0.4960 mol
Hydrogen is made of H₂ molecules, so 1 mol of it is 2.02 g. A mole of hydrogen atoms, H, is 1.008 g.
Molar mass of hydrogen: quick answers
What is the molar mass of hydrogen?
The molar mass of hydrogen, H₂, is 2.02 g/mol. So 1 mol of hydrogen has a mass of 2.02 g.
How do you calculate the molar mass of H₂?
Add the atomic masses of all the atoms: 2 × 1.008 = 2.02 g/mol.
How many moles are in 100 g of hydrogen?
Divide the mass by the molar mass: 100 ÷ 2.02 = 49.6 mol of H₂.